CN101252552B - Embedded type household network gateway supporting wireless audio and video transmissions - Google Patents
Embedded type household network gateway supporting wireless audio and video transmissions Download PDFInfo
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- CN101252552B CN101252552B CN2008100198638A CN200810019863A CN101252552B CN 101252552 B CN101252552 B CN 101252552B CN 2008100198638 A CN2008100198638 A CN 2008100198638A CN 200810019863 A CN200810019863 A CN 200810019863A CN 101252552 B CN101252552 B CN 101252552B
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Abstract
An embedded household network gateway which supports wireless audio and video transmission is capable of enabling a remote user to be connected to a PC on internet; a close user on PDA can, through the invention, wirelessly and uniformly control electric appliances such as a washing machine and an air conditioner, watch audio and video with large flux and high speed transmitted at real time by film and video entertainment equipments such as a digital television, a DVD, play and store at real time the information recorded by video monitoring aids. The network gateway device comprises an audio and video signal processing module, a core module, a Bluetooth module, and an IEEE802.11g module. The audio and video signal processing module is mainly composed of an audio and video compression and encoding chip, a video A/D decoding chip, and an audio A/D converter. The core module, taking a micro-processor as the center, is connected with the audio and video signal processing module through a bus, with the Bluetooth module through a RS232 interface, and with the IEEE802.11g module through a USB interface, and can be connected to the netting twine of a local area network through a Rj45 tie-in.
Description
Technical field
This invention can be used for the various electric equipments in the family, carry out long-range and real-time control and visit short range, promptly by this equipment, the long-distance user can be connected on the PC of the Internet, short range user unifies control apparatus equipment (as washing machine, air-conditioning etc.) with wireless mode on PDA, watch video display amusement equipment (as digital TV, DVD etc.) the big flow of real-time Transmission, the audio-video frequency content of two-forty, the information under broadcast and store video watch-dog are recorded in real time; This equipment is under the jurisdiction of the home networking gateway apparatus technology.
Background technology
Along with the raising of computer electronic technology, development of internet technology and living standards of the people, the notion of home network is arisen at the historic moment.Home network is the comprehensive network system that intelligent service is provided, promptly portion couples together various electric equipments and electrical equipment subsystem by certain transmission medium within the family, pass through gateway, internally realize resource-sharing, to the interconnection of external enwergy and external network and carry out information exchange, the major function of home network has equipment control, energy conservation, security service and communication service.
Aspect equipment control and energy conservation, the user unifies control by home networking gateway to all household electrical appliances.Gateway has the function of web server, and the user visits the webpage that stores in the gateway by the web browser, controls household electrical appliances by the associated button on the webpage clicking.Aspect security service and communication service, the audio frequency and video transmission is one of important service of home network.The video server that is applied to family is realizing having brought into play important effect aspect family's audio, video data transmission and the video monitoring.Home networking gateway should have the function of video server, thereby realizes the audio, video data real-time Transmission and the monitoring remote video of big flow, two-forty.
Present home networking gateway has only single function usually, can only use as the web server, perhaps can only use as video server, and can not accomplish externally the Internet and in home-ranges in visit.Along with the development of family digitalization, home networking gateway should provide more complete function.By it, the user can realize can watching the audio-video frequency content of video display amusement equipment real-time Transmission to the unified control of the long-range and short range of electric equipment, can realize video monitoring.
Home networking gateway needs certain transmission medium to be connected with various electric equipments.At present, normally adopt wired mode to be connected between gateway and the domestic electric appliance, it is loaded down with trivial details to connect up, and need rethink wiring problem when electric equipment moves.Therefore can consider to use just on gateway and electric equipment, to use wireless communication module simultaneously by wireless mode, to reach the purpose of intercommunication mutually.
Normally used short-distance wireless communication technology mainly contains infrared (IrDA), family's Intranet (HomeRF), IEEE 802.11 and bluetooth etc. in home environment.Wherein infrared cost is minimum, but its communication distance is generally less than 1 meter, and the angle of the infrarede emitting diode of communicating pair and detection head must not also will guarantee unscreened condition above 30 degree.Family's Intranet is widened narrow radio channel, is easy to generate the phase mutual interference between the equipment.The transmission range of IEEE 802.11 is more than 100 meters, and wherein IEEE 802.11g can provide the bandwidth up to 54Mbps.Then interference free performance is rather noticeable flexibly because its moderate cost reaches for Bluetooth technology.
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of embedded type household network gateway of supporting the wireless audio and video transmission.By this gateway, the long-distance user can be connected on the PC of the Internet, short range user is on PDA, with electric equipments such as the unified control of wireless mode washing machine, air-conditionings, watch the big flow of video display amusement equipment real-time Transmission such as Digital Television, DVD, the audio-video frequency content of two-forty, the information under broadcast and store video watch-dog are recorded in real time.
Technical scheme: the present invention is a kind of based on the MPEG4 technology of video compressing encoding, the home networking gateway equipment of IEEE 802.11g and Bluetooth technology.Mainly formed by audio-video signal processing module, nucleus module, bluetooth module and IEEE 802.11g module.The audio-video signal processing module comprises audio frequency and video compressed encoding chip, data register A, video a/d decoding chip, crystal oscillator A, single-chip microcomputer, crystal oscillator B, audio A/D transducer, crystal oscillator C, AV composite video interface, wherein audio frequency and video compressed encoding chip joins with data register A, video a/d decoding chip, audio A/D transducer respectively, microprocessor through bus in the nucleus module is connected with audio frequency and video compressed encoding chip, and video a/d decoding chip and audio A/D transducer is by AV composite video interface difference input analog video signal and simulated audio signal;
Nucleus module comprises: microprocessor, crystal oscillator D, crystal oscillator E, reset, the current mouthful driver of JTAG debug port, data register B, flash memory, asynchronous serial, RS232 interface A, RS232 interface B, USB master's mouth, USB be from mouth, ethernet transceiver, crystal oscillator F, RJ45 joint, wherein the audio-video signal processing module is connected with microprocessor by bus
The RS232 interface of bluetooth module is connected with RS232 interface B, RS232 interface B is connected with the current mouthful driver of asynchronous serial, the USB mouth of IEEE 802.11g module is connected with USB master's mouth, USB master's mouth is connected with microprocessor, microprocessor respectively with crystal oscillator D, crystal oscillator E, reset, the current mouthful driver of JTAG debug port, data register B, flash memory, asynchronous serial, USB master's mouth, USB join from mouth, ethernet transceiver, ethernet transceiver is connected to the local area network (LAN) netting twine by the RJ45 joint.
Single-chip microcomputer and video a/d decoding chip pass through I
2The C bus is joined.The video a/d decoding chip is connected by the digital visual interface that meets the CCIR601 standard with audio frequency and video compressed encoding chip.Audio A/D transducer and audio frequency and video compressed encoding chip pass through I
2The S bus is joined.The data terminal DD of audio frequency and video compressed encoding chip and address end DA join with data terminal DD and the address end DA of data register A respectively.The data terminal hd of audio frequency and video compressed encoding chip and address field ha join with the data terminal D and the address end A of microprocessor respectively.The data terminal D of data register B and address end A join with the data terminal D and the address end A of microprocessor respectively.The data terminal D of flash memory and address end A join with the data terminal D and the address end A of microprocessor respectively.
Beneficial effect: this invention has following advantage:
1) only needs just can insert this gateway device by importing corresponding network address on the internet, realize Long-distance Control easily;
2) the short range user can insert this gateway device by wireless mode, as just controlling household electrical appliance by PDA;
3) can realize audio, video data transmission real-time, flow, two-forty greatly and monitoring in real time, image sharpness height; Resolution can reach 720*576, and frame per second can reach 25fps;
4) electric equipment and gateway are followed the TCP/IP related protocol by the IP address designation, are convenient to external equipment interconnectedly, and the user can use the web browser to visit the webpage of storing in the gateway;
5) adopt bluetooth approach to be connected between this gateway and the household electrical appliance, need not loaded down with trivial details wiring, data transmission security is reliable;
6) adopt the IEEE802.11g of two-forty to realize the audio frequency and video transmission, can provide 20Mbps above transmission bandwidth, for high definition video steaming provides enough transmission channels;
7) transmitting power of the communication that adopts is all followed international standard, and to human body safety, penetrable dielectric is not influenced by nonmetal barrier;
8) low-power consumption moves more stablely, and the life-span is longer;
9) low cost is convenient to promote.
Description of drawings
Fig. 1 is a general structure block diagram of the present invention.Bluetooth module 1 is wherein arranged, IEEE 802.11g module 2, audio frequency and video compressed encoding chip 3, data register A4, video a/d decoding chip 5, crystal oscillator A6, single-chip microcomputer 7, crystal oscillator B8, audio A/D transducer 9, crystal oscillator C10, AV composite video interface 11, microprocessor 12, crystal oscillator D13, crystal oscillator E14, reset 15, JTAG mouth 16, data register B17, flash memory 18, the current mouthful driver 19 of asynchronous serial, RS232 interface A20, RS232 interface B21, USB master's mouth 22, USB is from mouth 23, ethernet transceiver 24, crystal oscillator F25 and RJ45 joint 26.
Fig. 2 is an application scenarios schematic diagram of the present invention.
Fig. 3 is circuit theory diagrams of the present invention.Wherein Fig. 3-1 is the circuit theory diagrams of single-chip microcomputer 7; Fig. 3-2 is the circuit theory diagrams of video a/d decoding chip 5; Fig. 3-3 is the circuit theory diagrams of audio A/D transducer 9; Fig. 3-4 is the circuit theory diagrams of audio frequency and video compressed encoding chip 3; Fig. 3-5 is the circuit theory diagrams of data register A4; Fig. 3-6 is the circuit theory diagrams of microprocessor 12; Fig. 3-7 is the circuit theory diagrams of data register B17; Fig. 3-8 is the circuit theory diagrams of flash memory 18; Fig. 3-9 is the circuit theory diagrams of ethernet transceiver 24; Fig. 3-10 is the circuit theory diagrams of RJ45 joint 26; Fig. 3-11 is RS232 interface A20, RS232 interface B21, USB master's mouth 22, the USB circuit theory diagrams from mouth 23.
Embodiment
Home networking gateway outfit of equipment structured flowchart
This invention comprises audio-video signal processing module, nucleus module, bluetooth module and IEEE 802.11g module.The audio-video signal processing module is used for the composite video signal of input is carried out digitlization and compressed encoding; Nucleus module adopts built-in Linux operating system, is core with the microprocessor, and data register A, flash memory move ICP/IP protocol stack, the driver of audio-video signal processing module and IEEE802.11g modules driver as peripheral circuit on it; Move bluetooth protocol repertory on the bluetooth module; Operation IEEE 802.11g protocol stack on the IEEE802.11g module; Both all are used for modulation, reception and transmission electromagnetic wave.
The application scenarios of home networking gateway equipment
Be connected with bluetooth module on the household electrical appliance such as washing machine, air-conditioning, refrigerator, by bluetooth approach and home networking gateway devices communicating, the first-class video monitoring equipment of monitoring camera directly links to each other with gateway by the composite video signal interface with audio-visual devices such as Digital Television, DVD.Gateway device links to each other with local area network by netting twine, thereby is connected to Internet, realizes Long-distance Control.Gateway device is connected to the PDA that has IEEE802.11g by the IEEE802.11g module, thereby realizes short range control.
User at the Internet other end or use PDA imports corresponding IP address at the web browser, has access to gateway device.Select corresponding electrical equipment option on the webpage, " checking " button on the webpage clicking can be seen the electric operation state; Click the control command option, the control commands corresponding sign indicating number will transfer to household electrical appliances by gateway, and household electrical appliances are transferred to gateway with running status with the form of return code, and are shown on webpage behind complete operation; When the needs video monitoring, click " video monitoring " option, can show the image information that camera monitors on the window of opening; When clicking " Digital Television ", can show the in progress video pictures of TV on the window, audio-frequency information is play by device synchronization such as audio amplifiers.
Circuit theory diagrams
Fig. 3 is this inventive circuit schematic diagram, wherein mainly comprise audio frequency and video compressed encoding chip 3, video a/d decoding chip 5, audio A/D transducer 9, microprocessor 12, bluetooth module 1, IEEE 802.11g module 2, and data register A4, crystal oscillator A6, single-chip microcomputer 7, crystal oscillator B8, crystal oscillator C10, AV composite video interface 11, crystal oscillator D13, crystal oscillator E14, reset 15, JTAG mouth 16, data register B17, flash memory 18, the current mouthful driver 19 of asynchronous serial, RS232 interface A20, RS232 interface B21, USB master's mouth 22, USB is from mouth 23, ethernet transceiver 24, crystal oscillator F25, RJ45 joint 26.
The present invention's (supporting the embedded type household network gateway of wireless video transmission) organically combines the swiftest and the most violent embedded technology, audio frequency and video compression coding technology, WiFi technology and the Bluetooth technology of development at present, thereby provide from long-range and short range and unify control apparatus equipment, watch the big flow of video display amusement equipment real-time Transmission, the audio-video frequency content of two-forty, the function of the information that real-time storage and playback video watch-dog are noted.Main contents are the circuit of specific implementation, and it totally constitutes block diagram as shown in Figure 1.
Wherein the audio-video signal processing module comprises the audio-video signal collection, and A/D conversion and compressed encoding have mainly been realized the digitlization of analog audio-video signal and the function of compressed encoding.AV composite video interface 11 is used for the input to the analog audio-video signal, video a/d decoding chip 5 is used for analog video signal is changed into the digital video signal that meets the CCIR-601 standard, single-chip microcomputer 7 is used for the video a/d decoding chip is carried out initial configuration, and audio A/D transducer 9 is used for simulated audio signal is converted into I
2The serial digital audio signal of S form, audio frequency and video compressed encoding chip 3 is used for the audio and video data streams after the digitlization is compressed, and gives microprocessor 12 then, and data register A4 is used for providing buffer memory to data to be compressed.
The center of nucleus module is a microprocessor 12, and its peripheral circuit comprises data register B17, flash memory 18, two USB mouths, two RS232 serial ports of expansion, Ethernet interface, also comprises resetting and the JTAG debug port.Wherein data register B17 is used for temporarily storing some ephemeral datas; Flash memory 18 is equivalent to the hard disk of computer, and built-in Linux operating system, ICP/IP protocol stack, the driving of audio-video signal processing module, Ethernet driving and IEEE 802.11g module drive have been installed in the inside; USB master's mouth 22 is used to connect IEEE802.11g module 2, and RS232 interface B21 is used to connect bluetooth module 1, and microprocessor 12 is connected with audio frequency and video compression coding and decoding chip 3 by bus, reads the data after the compression.
Bluetooth module is connected to nucleus module by the RS232 interface, is used to provide the wireless connections between the bluetooth module of nucleus module and home appliance.The IEEE802.11g module is connected to nucleus module by the USB mouth, is used to provide the wireless connections between nucleus module and the user terminal.
Wherein RS232 interface A20 is used to export the Debugging message of microprocessor 12, USB is used for the external memory device of carry from mouth 23, JTAG debug port 16 is used for microprocessor 12 is carried out debugging bottom most, crystal oscillator A6, B8, C10, F25 are respectively video a/d decoding chip 5, audio A/D transducer 9, single-chip microcomputer 7, ethernet transceiver 24 clock signal are provided, crystal oscillator D13, crystal oscillator E14 provide clock signal for microprocessor 12, resetting 15 is used to microprocessor 12 that hand-reset is provided, and RJ45 joint 26 is used to provide netting twine to connect.
The concrete course of work is:
When carrying out equipment control and energy conservation, the bluetooth module of this equipment at first and between the bluetooth module of household electrical appliances is set up Radio Link, then, the webpage that the user can store in this equipment by the web browser access, the corresponding button on the webpage clicking, make microprocessor send a control command word by serial ports, bluetooth module is received after this control command word by serial ports, send to the bluetooth module of household electrical appliances end, send into household electrical appliances by it, the operation of control household electrical appliances, the sign indicating number that returns of household electrical appliances is issued this home networking gateway equipment by identical link, thereby be presented on the webpage, thereby the user can see the state of control back household electrical appliances.
When carrying out safety management and communication service, the composite video signal of outputs such as simulation camera or Digital Television is input to this equipment by the AV composite video interface, be admitted in the internal memory of microprocessor through the data behind A/D conversion and the compressed encoding then, the built-in Linux operating system that runs on the microprocessor sends data outward by the ICP/IP protocol stack.In physical layer, both can send in the Internet by Ethernet, also can deliver on the in-plant PDA by IEEE 802.11g module, after user side was received data, the playing program of operation band MPEG4 decoder can be watched video content.
When the user who is arranged in the Internet other end or use PDA need check the electric equipment situation of family, by importing correct IP address, have access to home networking gateway equipment, in webpage, click the control button of corresponding electric appliance equipment again, promptly addressable and this electrical equipment of control.Such as, click " video monitoring ", can see the picture of camera collection; Click " Digital Television ", can appreciate the content of television for play; Click by " air-conditioning ", can see the operating state of air-conditioning, and can carry out operations such as opening power, powered-down, adjusting mode of operation and adjusting temperature by the corresponding button on the webpage clicking.
Embodiment:
The embodiment of the IEEE802.11g module of the 7708 bluetooth modules+Zydas company of the big mobile interconnected Co., Ltd in microprocessor chip AT91RM9200+ east of the audio frequency and video compressed encoding chip I ME6400+ATMEL company of Intime company
Audio frequency and video compressed encoding chip 3 adopts the chip I ME6400 of Intime company, video a/d decoding chip 5 adopts the SAA7111WP of Phillp company, audio A/D transducer 9 adopts the CS5334 of CRYSTAL company, microprocessor 12 adopts the AT91RM9200 of atmel corp, its dominant frequency is 200MHz, bluetooth module 1 adopts the big 7708 blue teeth wireless transceiver modules that move interconnected Co., Ltd in east, IEEE 802.11g module
2 adopt the Zd1211802.11g module of Zydas company, data register A4 adopts the SDRAM of the 8Mbyte of Micron, MT48LC16M4A2, data register B17 adopts the SDRAM HY57V281620A of the 16Mbyte of two Hynix, flash memory 18 adopts two chips, a slice is the NorFlash of the 2Mbyte of AMD, Am29LV160B, another sheet is the Nor Flash of the 2Mbyte of ATMEL, AT49BV322A, that the current mouthful driver 19 of asynchronous serial adopts is the MAX213E of MAMIX, that ethernet transceiver 24 adopts is the DM9161 of DAVICOM, can be operated under the mode of operation of 10MBASE-TX or 100MBASE-TX, that single-chip microcomputer 7 adopts is the AT89C2051 of ATMEL, crystal oscillator A6, crystal oscillator B8, crystal oscillator C10, crystal oscillator D13, crystal oscillator E14, the output pulse frequency of crystal oscillator F25 is respectively 24.576MHz, 11.059MHz, 12.2880MHz, 18.432MHz, 32.768KHz, 24.576MHZ.Also have AV composite video interface 11, JTAG mouth 16, RS232 interface A20, RS232 interface B21, USB master's mouth 22, USB in addition from mouth 23 and RJ45 joint 26.
Claims (8)
1. an embedded type household network gateway equipment of supporting the wireless audio and video transmission is characterized in that this equipment is made up of audio-video signal processing module, nucleus module, bluetooth module (1), IEEE 802.11g module (2); The audio-video signal processing module comprises audio frequency and video compressed encoding chip (3), data register A (4), video a/d decoding chip (5), crystal oscillator A (6), single-chip microcomputer (7), crystal oscillator B (8), audio A/D transducer (9), crystal oscillator C (10), AV composite video interface (11), wherein audio frequency and video compressed encoding chip (3) respectively with data register A (4), video a/d decoding chip (5), audio A/D transducer (9) joins, microprocessor in the nucleus module (12) is connected with audio frequency and video compressed encoding chip (3) by bus, and video a/d decoding chip (5) and audio A/D transducer (9) is by AV composite video interface (11) difference input analog video signal and simulated audio signal;
Nucleus module comprises: microprocessor (12), crystal oscillator D (13), crystal oscillator E (14), reset (15), JTAG debug port (16), data register B (17), flash memory (18), the current mouthful driver (19) of asynchronous serial, RS232 interface A (20), RS232 interface B (21), USB master's mouth (22), USB are from mouth (23), ethernet transceiver (24), crystal oscillator F (25), RJ45 joint (26), and wherein the audio-video signal processing module is connected with microprocessor (12) by bus;
The RS232 interface of bluetooth module (1) is connected with RS232 interface B (21), current mouthful of driver (19) of RS232 interface B (21) and asynchronous serial is connected, the USB mouth of IEEE 802.11g module (2) is connected with USB master's mouth (22), USB master's mouth (22) is connected with microprocessor (12), microprocessor (12) respectively with crystal oscillator D (13), crystal oscillator E (14), (15) reset, JTAG debug port (16), data register B (17), flash memory (18), the current mouthful driver (19) of asynchronous serial, USB master's mouth (22), USB is from mouth (23), ethernet transceiver (24) joins, and ethernet transceiver (24) is connected to the local area network (LAN) netting twine by RJ45 joint (26);
Home networking gateway carries out wireless connections by bluetooth module (1) and household electrical appliance with bluetooth approach; Home networking gateway connects analog video signal and simulated audio signal incoming line by AV composite video interface (11), and then is connected with audio-visual devices with video monitoring equipment; The ethernet transceiver of home networking gateway (24) connects the local area network (LAN) netting twine by RJ45 joint (26), and then is connected with Internet; Home networking gateway carries out wireless connections by IEEE 802.11g module (2) and PDA equipment in the IEEE802.11g mode.
2. the embedded type household network gateway equipment of support wireless audio and video transmission according to claim 1 is characterized in that single-chip microcomputer (7) and video a/d decoding chip pass through I
2The C bus is joined.
3. the embedded type household network gateway equipment of support wireless audio and video transmission according to claim 1 is characterized in that video a/d decoding chip (5) is connected by the digital visual interface that meets the CCIR601 standard with audio frequency and video compressed encoding chip (3).
4. the embedded type household network gateway equipment of support wireless audio and video transmission according to claim 1 is characterized in that audio A/D transducer (9) and audio frequency and video compressed encoding chip (3) pass through I
2The S bus is joined.
5. the embedded type household network gateway equipment of support wireless audio and video according to claim 1 transmission is characterized in that the data terminal DD of audio frequency and video compressed encoding chip (3) and address end DA join with data terminal DD and the address end DA of data register A respectively.
6. the embedded type household network gateway equipment of support wireless audio and video according to claim 1 transmission, it is characterized in that the data terminal hd of audio frequency and video compressed encoding chip (3) and address end ha respectively and the data terminal D of microprocessor (12) and address end A join.
7. the embedded type household network gateway equipment of support wireless audio and video according to claim 1 transmission, it is characterized in that the data terminal D of data register B (17) and address end A respectively and the data terminal D of microprocessor (12) and address end A join.
8. the embedded type household network gateway equipment of support wireless audio and video according to claim 1 transmission, it is characterized in that the data terminal D of flash memory (18) and address end A respectively and the data terminal D of microprocessor (12) and address end A join.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100198638A CN101252552B (en) | 2008-03-18 | 2008-03-18 | Embedded type household network gateway supporting wireless audio and video transmissions |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100198638A CN101252552B (en) | 2008-03-18 | 2008-03-18 | Embedded type household network gateway supporting wireless audio and video transmissions |
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| CN101252552A CN101252552A (en) | 2008-08-27 |
| CN101252552B true CN101252552B (en) | 2010-11-17 |
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| CN2008100198638A Expired - Fee Related CN101252552B (en) | 2008-03-18 | 2008-03-18 | Embedded type household network gateway supporting wireless audio and video transmissions |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101771861B (en) * | 2009-12-22 | 2013-11-06 | 中兴通讯股份有限公司 | Monitoring method and system |
| CN101883264A (en) * | 2010-06-30 | 2010-11-10 | 中山大学 | Digital home intelligent video gateway |
| CZ2012685A3 (en) * | 2012-10-09 | 2013-11-20 | Ceské vysoké ucení technické v Praze - Fakulta elektrotechnická | Circuit arrangement for integrated control and management in service networks of smart buildings |
| CN107483852A (en) * | 2017-09-26 | 2017-12-15 | 东莞市博成硅胶制品有限公司 | One kind monitoring converter and its application |
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| CN1387345A (en) * | 2002-07-12 | 2002-12-25 | 北京长信嘉信息技术有限公司 | Communication method between digital home network gateway and main gateway |
| CN2550973Y (en) * | 2002-05-17 | 2003-05-14 | 清华同方股份有限公司 | Device for household network gateway |
| CN1505886A (en) * | 2001-04-26 | 2004-06-16 | ���dz� | Home networking gateway |
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| CN1505886A (en) * | 2001-04-26 | 2004-06-16 | ���dz� | Home networking gateway |
| CN2550973Y (en) * | 2002-05-17 | 2003-05-14 | 清华同方股份有限公司 | Device for household network gateway |
| CN1387345A (en) * | 2002-07-12 | 2002-12-25 | 北京长信嘉信息技术有限公司 | Communication method between digital home network gateway and main gateway |
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